STEPHEN LYNCH is one of the few comedians to truly achieve success with musical comedy. Not only was he recognized for his humorous humming by Comedy Central when it gave him his own special, but his leading role in Broadway's The Wedding Singer earned Lynch a Tony nomination. His songs, like his jokes, are silly, random and very catchy. He performs at the Variety Playhouse Sat., SEPT. 22. $25. 8:30 p.m. 1099 Euclid Ave. 404-524-7354. www.variety-playhouse.com.